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|
(;module:
lux
(lux (control monad
[functor])
(data [text]
text/format
(coll [list "List/" Monad<List>]
[dict #+ Dict])
[number]
[product]
[bool]
[char]
[maybe]
[ident "Ident/" Codec<Text,Ident>]
error)
[compiler #+ Monad<Lux> with-gensyms]
(macro [ast]
[syntax #+ syntax: Syntax]
(syntax [common])
[poly #+ poly:])
[type]
))
## [Derivers]
(poly: #export (Functor<?> env :x:)
(with-gensyms [g!type-fun g!func g!input]
(do @
[#let [g!map (' map)]
[g!vars _] (poly;polymorphic :x:)
#let [num-vars (list;size g!vars)
new-env (poly;extend-env [:x: g!type-fun]
(list;zip2 (|> g!vars list;size poly;type-var-indices) g!vars)
env)]
_ (compiler;assert "Functors must have at least 1 type-variable."
(n.> +0 num-vars))]
(let [->Functor (: (-> AST AST)
(lambda [.type.]
(if (n.= +1 num-vars)
(` (functor;Functor (~ .type.)))
(let [type-params (|> num-vars n.dec list;indices (List/map (|>. %n ast;local-symbol)))]
(` (All [(~@ type-params)] (functor;Functor ((~ .type.) (~@ type-params)))))))))
Arg<?> (: (-> AST (poly;Matcher AST))
(lambda Arg<?> [value :type:]
($_ compiler;either
## Nothing to do.
(do @
[_ (poly;primitive :type:)]
(wrap value))
## Type-var
(do @
[_ (poly;var new-env (|> num-vars (n.* +2) n.dec) :type:)]
(wrap (` ((~ g!func) (~ value)))))
## Bound type-variables
(do @
[_ (poly;bound new-env :type:)]
(wrap value))
## Tuples/records
(do @
[[g!vars members] (poly;tuple :type:)
pm (mapM @
(lambda [:slot:]
(do @
[g!slot (compiler;gensym "g!slot")
body (Arg<?> g!slot :slot:)]
(wrap [g!slot body])))
members)]
(wrap (` (case (~ value)
[(~@ (List/map product;left pm))]
[(~@ (List/map product;right pm))])
)))
## Recursion
(do @
[_ (poly;recur new-env :type:)]
(wrap (` ((~ g!map) (~ g!func) (~ value)))))
)))]
($_ compiler;either
## Variants
(do @
[[g!vars cases] (poly;variant :x:)
pattern-matching (mapM @
(lambda [[name :case:]]
(do @
[#let [analysis (` ((~ (ast;tag name)) (~ g!input)))]
synthesis (Arg<?> g!input :case:)]
(wrap (list analysis
(` ((~ (ast;tag name)) (~ synthesis)))))))
cases)]
(wrap (` (: (~ (->Functor (type;to-ast :x:)))
(struct (def: ((~ g!map) (~ g!func) (~ g!input))
(case (~ g!input)
(~@ (List/join pattern-matching)))))
))))
## Tuples/Records
(do @
[[g!vars members] (poly;tuple :x:)
pm (mapM @
(lambda [:slot:]
(do @
[g!slot (compiler;gensym "g!slot")
body (Arg<?> g!slot :slot:)]
(wrap [g!slot body])))
members)]
(wrap (` (: (~ (->Functor (type;to-ast :x:)))
(struct (def: ((~ g!map) (~ g!func) (~ g!input))
(case (~ g!input)
[(~@ (List/map product;left pm))]
[(~@ (List/map product;right pm))])))
))))
## Functions
(with-gensyms [g!out]
(do @
[[g!vars [:ins: :out:]] (poly;function :x:)
.out. (Arg<?> g!out :out:)
g!envs (seqM @
(list;repeat (list;size :ins:)
(compiler;gensym "g!envs")))]
(wrap (` (: (~ (->Functor (type;to-ast :x:)))
(struct (def: ((~ g!map) (~ g!func) (~ g!input))
(lambda [(~@ g!envs)]
(let [(~ g!out) ((~ g!input) (~@ g!envs))]
(~ .out.))))))))))
## No structure (as you'd expect from Identity)
(do @
[_ (poly;var new-env num-vars :x:)]
(wrap (` (: (~ (->Functor (type;to-ast :x:)))
(struct (def: ((~ g!map) (~ g!func) (~ g!input))
((~ g!func) (~ g!input))))))))
## Failure...
(compiler;fail (format "Can't create Functor for: " (%type :x:)))
))
)))
|
